Hydraulic service jack



March 1, 1960 E. H. scHULTz 2,926,888

HYDRAULIC SERVICE JACK Filed Oct. 14, 1955 3 Sheets-Sheet l 52 47 i. ,lAIM. nl. .1!!1. 'll l /tg' n I E* l zz- :1*l *46 I f9.3. 45 iE-: 5:53:5-7 53 l 6/62 1 5/ 55 46 :30 54 59 o 'o 60 5 i a a y 4s 44 4/ 52 E V l I7/ a/ R5 a i Il 26 *fw-ffm 4 Ha 63. 27 '37 I i I 1` sii l J r; 7 66 s.99 I l j I @I 36 l L? l:-

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" /7/ .'25 4 INVENTOIL March 1, 1960 E. H. scHuLTz HYDRAULIC SERVICEJACK 3 Sheets-Sheet 2 Filed Oct. 14, 1955 Arran/145'. Y

March 1, 1960 E. H. vscn-lum'z 2,925,888

HYDRAULIC SERVICE JACK Filed oct. 14, 1955 s Sheets-Sheet 5 74 76 Cr/zlL/EN 0R.

BY M

States iatent` O 2,926,888 l HYDRAULIC sEnvroE JACK Edward H. Schultz,Milwaukee, Wis.

Application October 14, 1955, Serial No. 540,556

' 10 Claims. (C1. 2s42)` This invention relates to improvements inhydraulic service jacks.

It is a general object of the present invention to provide an improvedhydraulic service jack for use in garages, illing stations, and similarestablishments, said jack being principally/adapted to lift by.enga-gement with adapted to engage beneath a. bumper, and-whereintherey ".Fig. 2is a front elevational view of the detachable extensionfor the upper end of the cylinder;

Fig. 3is a sectional view taken on the line Fig. l;

.Fig 4 is a perspective view showing the jack in lowered condition andshowing the lifting arms in partf .1y spread condition;

Fig. 5 is a sectional view taken on the line 5--5 Vof Fig-4;

l Fig. 6 is a perspective view showing a portion of an automobile andshowing the jack in operative position is means for adjustably varyingthe horizontal distance between thearms so that bumper guards orotherprojections may be cleared.

A still further object of the .invention is to provide an hydraulicservicejack wherein there is an outer vertically disposed cylinder whichis `adapted to be elevatedby the actionot iiuid pressure, said cylinderhaving a top portion which may be used as a lifting element when it isdesired to, engage portions of a car other` than the bumper.

A still further object of the invention is to provide an hydraulicservice jack as -above described wherein the upper end-of the elevatingcylinder is constructed to detachably receive an upright extension. Thismakes it possible to raise the body of a car While the car `is! beingsupported on a lift and to do otherwork requiring a jack of extraheight. This is `often 'advantageous as an aid in spreading springs on`a car or in facilitating the .installation `ci shock absorbcrspmuiers,or tail pipes.

A further object of the invention is to provide an hydraulic servicejack having a xed vertical cylinder and having an outer verticalcylinder telescopically associated with said xed cylinder, there being anovel arrangement of rollers to prevent binding between the twocylinders which normally results when an automobile is oit-center on thejack;

Other objects of the invention are to provide anhydraulic service jack-which is relatively simple and inexpensive in construction, versatilein use, neat in appearance,ocompaot, `and `otherwise Well adapted for`the purpose described.

With the aboveand other' objects in view, the'tinventio-n consists ofthe improved hydraulic service jack, and all of its parts and`combinations, as set forth in the claims, and all equivalents thereof.

in the accompanying drawings, illustrating one complete embodiment ofthe preferred form of the invention, in which the` same referencenumerals designate the same parts `in all of the views;

Fig. i is a side elevational view of the improved jack in loweredcondition, parts `being broken away and rshown in vertical section;

Y 24 which rings snap with respect to the bumper;

Fig. 7 is a front elevational `view of the jack showing how it may beused to support and carry heavy tires or wheels, a tire' being shown insupported position, and the jack being equipped Vwith special tiresupporting rollers; and 1 i l Fig. 8 is a longitudinal sectional viewthrough the end r ol? one of the supporting `arms with a tire supportingroller of the type used in Fig. 7 connected thereto.

Referringmore particularly to the drawing first to Figs. l and 4, thebase comprises a pair of V-shaped memberslS and 16, preferablytubular,which members are welded to the lower end of an upright cylinder 17 inthe manner shown in Fig. 4. An axle 18 isuwelded as at 19 to endsof thebase members 15 and 16. Wheels Ztl are` rotatably-mounted on the ends ofthe axle 18. The opposite ends of the base members 15 and 16 are shapedto form horizontally disposed supports 21 for caster-assembliesZLp t. tt

Suitably supported within the fixed cylinder` 17 a short i distanceabo-ve the lower end thereof is a ram'disc 23.`

The latter is detachably supported between snap-rings into grooves 25 inthe interior of the cylinder 17 Bolted ibybolt 26 to--the ram disc 23 toprojectHupwardly therefrom is an elongated ram piston 27. The` latter.is telescopically associated within `an inner ram cylinder `28 whichmoves with the cylinder 34, there being just enough clearance between`the elongated piston 27 and its cylinder 28 `to provide for relativetelescopic movement. The lower' end of the inner ram cylinder `28isiscrewed intoithe4 upper end of a packing nut 29.' Also within thepacking nut 29 is a suitable seal 30twhich en.`

gagesaround the elongated `piston 2'7 to allow relative movement whilepreventingpescape of oil.`

Theupper end of the inner ram cylinder 28 is threaded into a threadedopening 31 in the bottom of a cylindrical 4 pumpbody--E'Z` The lower endof thepurnp body 32 is t. `of reduced diameter as at 33 to lit into theupper end.

of an outer cylinder'A 34, the upper end of the outer cylinder beingpreferably welded to the pump body as shown) t The lower end of theouter cylinderV 34 has outwardly and downwardly projecting brackets 35which rotatably carry rollers 36 on their lower ends. VThe rollersare ofa size to engage the exterior` of the xed cylinder 17 It is preferred toemploy four brackets and rollers apart so that if the load is oit-centerthe jackwill, nevertheless, 1

operate without binding between the lower end `ofrthe cylinder 34 andthe lower exterior inder 17.

It is preferred to form the exterior ofthe" cylinder 17 A locking. pin38 slidably mounted. in a tubular body.. 39 which projects at alrightangle from the `outer cylinder Patented Mar. 1, 1960` portion of .thecyli 34 may be moved into engageemnt with a suitable aperfully extendingposition as a safety measure duringcertain types ;of'u'se The pin may bereadily released from its lockinghole by pulling out on the knob 40.

Fitted in the upper end of the cylinder 17 and secured thereto by pins41 and surrounding the upper end of the ram cylinder 28 is a ring 42which supports a cage 43 for rollers 44. The latter rotatably engage theinterior of the. cylinder 34 as shown in Fig. l to prevent any bindingbetween the upper end of the cylinder 17 and the interior of thecylinder 34 should the load be offcenter. f

The upper end of the pump body 32 is of decreased diameter to iit withinthe lower end of a reservoir casing 45, said casing being suitablysecured in position, and there being a sealing ring as at 46. The upperend of the reservoir casing is closed by a cap 47 which is ribbed on topto provide a lifting head. The cover is removably held in position bymeansof a bolt 48 which extends downwardly through the cover and whichthreads into the upper end of the pump body 32.

Mounted for reciprocal movement in a horizontal bore 49 of the pump bodyis a pump piston 50. A link 51 has one end pivotally connected to theouter end of the pump piston and has its other end connected to theinner end of a handle 52. The latter is pivotally connected as at 53with' a bracket 54 which is rigidly attached to the pump body, therebeing a handle loop 55 rigidly connected to the bracket 54.

VA needle valve 56 is threaded into the pump body and has an externaloperating handle 57. The valve 56 controls the return ow of oilto thereservoirvthrough aductfSS.

When the operating handle 52 is raised and operated to pull the plunger50 in an outward direction, liquid from within the reservoir 45 issucked through the duct 59ipast` a non-return ball 60. On the returnstroke of `the plunger the ball 60 closes and the fluid is forced pastballv 61 into ducts 62 and 63 into the chamber 64 above the elongatedpiston 27 to force the cylinders 34 and 28 and attached parts upwardly.This, of course, includes the pump body and reservoir 45. To lower thejack the handle 57 is turned to open the needle valve .56 and allow,fluid toby-pass through the duct 58 back into the reservoir 45.

A pair yof L-shaped lifting arms 65 having horizontal bumper engaging"portions 66 have their upper ends pivotally `connected to the projectingends of a clamping assembly 67, the latter embracing the cylinder 34inter mediate its height. One of the lifting members 65 is pivotallyconnected to the clamping assembly lby the bolt 68. The other liftingarm is pivotally connected by a bolt 69 having a threaded end which isthreaded into a threaded hole 70 on one side of the clamping assembly.The other end of the bolt has a handle 71. When the bolt 7Q, is loosenedthe clamping assembly 67 may be slid up or downy on the cylinder-34, andthe assembly may be clamped in any selected position by tightening ofthe bolt 70, so as'to vvary' the horizontal distance between the bumperengagingportions 66 to best suit conditions. The arms 65 are connectedby pivoted links 72 with the lower portion of the cylinder 34 as isclear from Fig. 4.

In order to prevent the car from slipping off the jack, the ends of theportions 66 may be formed with integral shoulders 73.

If it is desired to use the jack for lifting and moving heavy. trucktires or Wheels, the arm portions 66 may be iitted with tire supportingroller assemblies 74 (see Figs. 7 and 8). Each roller assembly includesa cylinder 75 which tits within one of the tubular ends 66. Journalledwithin the cylinder 75 in bearings 76 is a shaft 77. kThe outer .end ofthe shaft is rigidly secured to the center of a disc 78 and the latterhas its periphery welded within 4 a cylindrical roller 79. Thus, thewheel 80 of Fig. 7 may be rotated onthe rollers 79 to change theposition of the bolts or for other purposes.

Referring now to Fig. 2, the numeralSl designates an extension memberhaving an auxiliary lifting head 82.`

The lower end of the extension 81 is connected to a cylinder 83 ofincreasedf diameter which is of a size to fit over the reservoir casing45. Between the main portion of the extension S1 Vand the portion 83 isan internal shoulder 84 which is adapted to seat on the cap 47 of Fig.l. The part 83 has a cut-out 85 to clear the operating'members on thepump body. This extension is used when parts other than a bumper are tobe engaged, and is particularly useful when extra height is required as,for example, when a car is on a garage lift. In such a situation it isfrequently desirable to raise the body of the car so as to spreadsprings or facilitate the installation of shock absorbers, mufllers ortail pipes. The extension 83 makes it possible to d0 this type of jobefficiently.

Operation the adjustment bolt A7 0 is first turned to free the clamp 67.

The clamp is then raised or lowered to obtain a desired` horizontaldistance between the two bumper engaging portions 66 of the liftingarms. On a car such as that shown in Fig. 6, it is desirable to spreadthe armV portions 66 suiiiciently far so as to clear the bumper guards85. When the desired adjustment has been obtained, the bolt 70 istightened so as to tightly clamp the clamping assembly 67 to thecylinder 34. The operating handle 52 is then raised and operated in apumping manner to pump uid into the chamber 64a above the piston 27 asheretofore described. This causes the jack to raise as shown in Fig. 6.To lower the jack it is merely necessary to open the valve 56 throughthe handle 57 so as to allow Vfluid from the chamber 64 toescape backinto the reservoir 45.

If it is desired to engage portions of a car other than the bumper, thelifting head 47 of the reservoir cap may be employed, or the liftinghead 82 of the extension member as heretofore described, depending uponheight requirements.

If it is desired to use the jack for handling heavy tires or wheels, theroller assemblies 74 are inserted within the ends of the lifting membersas shown in Fig. 8 and the jack may be adjusted so that the rollers arecloser together as shown in Fig. 7. It is to be noted that the innerend` of a member engages the curve of the wall of the tube 66 tofrictionally hold itself in position.

During use of the jack, the engagement of the pin 38 within the ,groove37 of the cylinder 17 prevents undesirable rotation between thecylinders 34 and 17.

When the jack is being operated it is unnecessary to obtain a perfectbalance of the car on the jack because no binding of the jack ispossible. Even if the car is sub- ,stantially off-center on the jack,the rollers 44 which may be relatively light in weight and relativelyinexpen- The operating mechanism is ex-v sive in construction. tremelysimple, rendering the jack relatively foolproof.

Due to the fact that the piston 27 is anchored to the base, and that thecylinders 28 and 34, and lifting members are movable together, it ispossible, by opening the relief valve 56, to speed up a liftingoperation by manually lifting the jack until the lifting members 66engage the bumper.

This makes the actualV operation much` quicker as it is unnecessary `todo a slow pumping in order to get an initial engagement. As soon as thebumper is engaged, the relief valve must be` closed to e prevent the oilfrom returning to the reservoir.

Various changes and` modifications may be made, without departing fromthe spirit of the invention, and all of such changes arecontemplated, asmay come within the scope of the claims. Y

What I claim is; e

1. In a hydraulic service jack of the type having a base, having anupright supporting member, having an outer cylinder telescopicallysupported on said upright supporting member, and having fluid pressureoperated means for causing elevating extensible movement of said outercylinder, a pair of lifting arms each having a lower and object-engagingportion, a link for each lifting arm pivotally connected at its upperend to its lifting arm a substantialdistance below the upper end thereofand at its lower end in longitudinally xed position on said outercylinder, a clamping assembly to which the upper ends of said liftingarms are pivotally connected, and means for" clamping said clampingassembly in a selected position ton said cylinder to thereby vary thedistance between saidV object engaging portions of the lifting t arms tosuit conditions.

2. In a hydraulic service jack of the type having a base, having anupright supporting member, having an outer cylinder telescopicallysupported on said upright supporting member, and having fluid pressureoperated means for causing elevating extensible movement of said outercylinder, apair of lifting arms each having a main portion disposed in avertical plane and having a horizontal object engaging portioma link foreach lifting arm pivotally connected at its upper end tothe main portionof its lifting arm intermediate its length and at its lower end inlongitudinally fixed position on a lower portion of said outer cylinder,a clamping assembly to which the upper ends of said lifting arms arepivotally connected, and means for clamping said clamping assembly in aselected position on said cylinder to thereby vary the dislll tancebetween said object engaging portions of the lifting arms to suitconditions.

3. In a hydraulic service jack of the type having a base, having anupright supporting member, having an outer cylinder telescopicallysupported on said upright supporting member, and having lluid pressureoperated means for causing elevating extensible movement of said outercylinder, a pair of lifting arms each having a main portion disposedinta vertical plane and having a horizontal object engaging portion, aclamping assembly embracing said outer cylinder and having endsprojecting in opposite directions therefrom, means pivotally connectingthe upper ends of said lifting arms to said projecting ends of saidclamping assembly, means for clamping said clamping assembly in aselected position on said cylinder, and means between said arms andcylinder for varying the spacing between the objectengaging portionsthereof.

4. ln a hydraulic service jack of the type having a base, having anuprightsupporting member, having an outer cylinder telescopicallysupported on said upright supporting member, and having tluid pressureoperated means for causing elevating extensible movement of said outercylinder, a pair of lifting arms each having a main portion disposed ina vertical plane and having a horizontal object engaging portion, aclamping assembly embracing `said outer cylinder and having endsprojecting in opposite directions therefrom, means pivotally connectingthe upper ends of said lifting arms to said projecting ends of saidclamping assembly, means for clamping said clamp* ing assembly in aselected position on said cylinder, and means including pivoted linksconnected to said lifting arms and cylinder below said clamping assemblyfor spreading the lower ends of the latter in response to movement ofthe clamping assembly on the cylinder,

5. In a hydraulic service `jaclt of thetype having a base,

having an `upright supporting member, having` an outer i cylindertelescopically supported on said upright support- Aing member, andhaving uid pressure operated` means for causing elevating `extensiblemovement of said outer cylinder, a pair of lifting arms eachhavingamain` portion disposed in a vertical plane and having a horizontalobject-engaging portion, a link for each lifting arm pivotally connectedat its upper end to the main portion of its lifting arm intermediate thelength thereof and at its lower Aend in longitudinally fixed position onthe outer cylinder,

a` pair of clamping members embracing said outer cylinder and havingsets` of ends projecting `in opposite direc* tions beyond `saidcylinder,` meansl pivotally ,connecting the upper end of one of saidlifting arms between one f set of projecting ends of said clampingmembers, and

an `upright tubularsupporting member,` an outer cylinder`.telescopically supported on said upright supporting mem* ber, uidpressure operated means including a cylinder and piston assembly withinsaid tubular supporting member for causing elevating extensible movementof said outer cylinder, means for preventing binding between the outercylinder and said upright supporting member including roller meanscarried near the upper end of said upright supporting member andembracing said cylinder and piston assembly and engaging the interior ofsaid outer cylinder, said outer cylinder having means for engagementwith an object Vto be lifted.

7. An hydraulic service jack comprising a base having an uprightsupporting member, an upright elongated piston projecting upwardly fromthe base within said supporting member and surrounded thereby, an outercylinder telescopically supported on said upright supporting member andhaving a head, an inner cylinder projecting downwardly from said headwithin said outer cylinder and movable therewith, said inner cylinderbeing telescoped over said elongated piston and there being a ychamberwithin said inner cylinder between the upper end of said elongatedpiston and said head, and means for introducing lluid under pressureinto said chamber to cause elevating movement of the inner and outercylinders and head with respect to said xed supporting member andelongated piston.

8. An hydraulic service jack comprising a base having an uprightsupporting member, an upright elongated piston projecting upwardly fromthe base within said supporting member and surrounded thereby, an outercylin der telescopically `supported on said upright supporting memberand having ahead with a hollow upper portion to provide a uidreservoirgan inner cylinder projecting downwardly from said head withinsaid outer cylinder and movable therewith, said inner cylinder beingtelescoped over said elongated piston and there being a chamber withinsaid inner cylinder between the upper end of said elongated piston andsaidhead, and means for introducing fluid under pressure from saidreservoir into saidv chamber to cause elevating movement of the innerand outer cylinders and head with respect to said fixed supportingmember and elongated piston.

9. An hydraulic service jack comprising a base having an uprightsupporting member, an upright elongated piston projecting upwardly fromthe base within said sup-` porting member and surrounded thereby, anouter cylin over said elongated piston, there being a chamber betweenthe upper end of said elongated piston and said head, and meansincluding a pump in said pump body for introducing fluid under pressurefrom said reservoir into said chamber to cause elevating movement of theinner and outer cylinders and head with respect to said xed supportingmember and elongated piston.

10. An hydraulic service jack comprising a base having an uprightsupporting member, an upright elongated piston projecting upwardly fromthe base Within said supporting member and surrounded thereby, an outercylin-v der telescopically supported on said upright supporting memberand having a head, an inner cylinder projecting downwardly from saidheadv within said outer cylinder and movable therewith, said innercylinder being telescoped over said` elongated Vpiston and Vthere beinga chamber within said inner cylinder between the upper end of saidelongated pistonand said head, means for introducing fluid underpressure into said chamber to cause elevating movement of the inner andouter cylinders and head with respect vto said fixed supportingmember-and elongated piston, and means for preventing binding betweenthe outer cylinder and upright supporting member Y 8' l including rollermeans carried nearthe upper end of said upright supporting memberbetween said inner cylinder and the outer cylinder and engaging theinterior of said outer cylinder.

i References Cited in the le of this patent UNITED STATES PATENTS607,310 Wellock July 12, 1898 2,450,608 Page Oct. 5, 1948 2,505,187Iuergens Apr. 25, 1950 2,527,841 Mueller Oct. 31, 1950 2,536,550 HughesJan. 2, 1951 2,545,440 Barber Mar. 20, 1951 2,568,827 Schallock Sept.25, 1951 2,583,216 Holfman Jan. 22, 1952 2,600,741 Drum June 17, 19522,664,073 Pine Dec. 29, 1953 2,669,424 Branick Y Feb. V16, 19542,675,990 Branick Apr. 20, 1954' 2,747,837 Turner May 29, 1956 2,763,465VTosi etal Sept. 18, 1956 2,786,453 Pine Mar. 26, 1957

